ed6713 wrote:
I don't think there is an E-450 chassis out there that can safely drag more than 5,000# around.
It's probably not the E450 chassis per se with it's 4:56 rear differential, large diameter driveshaft, and 5-speed (6 speeds internal) transmission ... as delivered by Ford that presents the problems.
The problems are more likely the sturdiness and length of the frame extensions that Class C motorhome manufacturers weld onto the Ford OEM frame ... plus the issue that many Class C motorhome owners have with a truck engine that is designed for, and requires, high RPM travel up grades in order to tap the necessary (V10's) horsepower. ;)